/*******************************************************************************
 *
 * Pentaho Big Data
 *
 * Copyright (C) 2002-2012 by Pentaho : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 ******************************************************************************/

package org.pentaho.hadoop.mapreduce;

import org.pentaho.di.core.row.RowMetaInterface;

abstract class BaseKeyValueOrdinals {
  private int keyOrdinal = -1;
  private int valueOrdinal = -1;
  
  public BaseKeyValueOrdinals(RowMetaInterface rowMeta) {
    if(rowMeta != null) {
      String[] fieldNames = rowMeta.getFieldNames();    
      
      for(int i = 0; i < fieldNames.length; i++) {
        if(fieldNames[i].equalsIgnoreCase(getKeyName())) {
          keyOrdinal = i;
          if(valueOrdinal >= 0) {
            break;
          }
        } else if(fieldNames[i].equalsIgnoreCase(getValueName())) {
          valueOrdinal= i;
          if(keyOrdinal >= 0) {
            break;
          }
        }
      }
    }
  }
  
  protected abstract String getKeyName();
  protected abstract String getValueName();
  
  public int getKeyOrdinal() {
    return keyOrdinal;
  }
  
  public int getValueOrdinal() {
    return valueOrdinal;
  }
}